You should choose according to your bestie's mother's preferences. It's best to ask your bestie what her mother likes. The gift must be chosen thoughtfully to make your bestie's mother feel warm from the bottom of her heart. Here are some suggestions for you, I hope they can help you.
1. Women all like flowers, and sending flowers on birthdays is also necessary, but flowers always wither quickly and don't last long. I suggest you buy some bouquets made of cartoon toys. In addition, gold-plated roses are also very good. Roses symbolize mature women, and with the addition of gold plating, they show the charm of mature women.
2. I suggest you go to some websites that can customize gifts to order a unique little gift for your bestie's mother. For example, put a photo of your bestie's mother on a pillow. Your bestie's mother will definitely love it. I think this is also very warm. In short, no matter what it is, as long as your heart is conveyed, it's fine.
3. Give your best friend a necklace engraved with her mother's name. It is very popular to engrave names on necklaces. You can go to a designated website to customize it. This unique necklace in the world will definitely attract a lot of attention when worn around your neck.